Astronomy:Kepler-23

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Short description: Star in the constellation Cygnus
Kepler-23
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus[1]
Right ascension  19h 36m 52.5356s[2]
Declination +49° 28′ 45.253″[2]
Apparent magnitude (V) 14.0[3]
Characteristics
Spectral type G5[4]
Astrometry
Proper motion (μ) RA: 2.262±0.030[2] mas/yr
Dec.: 3.851±0.031[2] mas/yr
Parallax (π)1.1678 ± 0.0161[2] mas
Distance2,790 ± 40 ly
(860 ± 10 pc)
Details
Mass1.11[3] M☉
Radius1.52 ± 0.24[3] R☉
Luminosity0.79 ± 0.04[3] L☉
Temperature5760 ± 124[3] K
Metallicity [Fe/H]–0.09 ± 0.14[3] dex
Rotational velocity (v sin i)[3] km/s
Other designations
Gaia DR2 2135019107451751168, KOI-168, KIC 11512246, GSC 03564-01806, 2MASS J19365254+4928452[5]
Database references
SIMBADdata
KICdata

Kepler-23 is a star in the northern constellation of Cygnus, the swan. It is orbited by three known exoplanets. With an apparent visual magnitude of 14.0,[3] this star is too faint to be seen with the naked eye.

Planetary system

Planets b and c were discovered in 2011 and were confirmed in 2012.[6] An additional planet d was discovered in 2014.

The Kepler-23 planetary system[4][7][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.478+0.010−0.0091 MJ 0.075 7.106995 — — 0.1511±0.0068 RJ
c 0.189+0.036−0.033 MJ 0.099 10.742434 — — 0.278±0.0089 RJ
d 0.055+0.043−0.037 MJ 0.124 15.27429±0.00017 — — 0.1994±0.0079 RJ
Kepler-23.jpg
Kepler-23d
Discovery
Discovered byKepler science team [citation needed]
Discovery date2014 [9]
Transit method
Orbital characteristics
0.1240 AU [10]
Orbital period0.0418 [10]
StarKepler-23
Physical characteristics
Mass0.0550 (MJ) [10]


Kepler 23d

Kepler-23d is a super-Earth candidate orbiting the star Kepler-23, located in the constellation Cygnus.[10] The planet is 2.2 times wider than Earth[9] and is 0.0550 Jupiter masses.[10] The planet was located using data from the Kepler space telescope in 2014,[9] and was concluded to likely be a super-Earth.[9]

Habitability

The planet is a Venus-like exoplanet due to its proximity from its star; roughly 0.1240 AU away.[10] The planet hypothetically has a surface, although it would be almost similar to Venus’s landscape.[citation needed]

References

  1. ↑ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#cyg, retrieved 2011-12-15 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Kepler-23b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler23b/, retrieved 2011-12-06 
  4. ↑ 4.0 4.1 Schneider, Jean, Star: Kepler-23, http://exoplanet.eu/star.php?st=Kepler-23, retrieved 2011-12-06 
  5. ↑ "Kepler-23". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-23. 
  6. ↑ Ford, Eric B.; Fabrycky, Daniel C.; Steffen, Jason H.; Carter, Joshua A.; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V. et al. (2012), "Transit Timing Observations Fromkepler. Ii. Confirmation of Two Multiplanet Systems Via a Non-Parametric Correlation Analysis", The Astrophysical Journal 750 (2): 113, doi:10.1088/0004-637X/750/2/113, Bibcode: 2012ApJ...750..113F 
  7. ↑ Rowe, Jason F.; Bryson, Stephen T.; Marcy, Geoffrey W.; Lissauer, Jack J.; Jontof-Hutter, Daniel; Mullally, Fergal; Gilliland, Ronald L.; Issacson, Howard et al. (2014), Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems, doi:10.1088/0004-637X/784/1/45, Bibcode: 2014ApJ...784...45R 
  8. ↑ Van Eylen, Vincent; Albrecht, Simon (2015), "Eccentricity from Transit Photometry: Small Planets in Kepler Multi-Planet Systems Have Low Eccentricities", The Astrophysical Journal 808 (2): 126, doi:10.1088/0004-637X/808/2/126, Bibcode: 2015ApJ...808..126V 
  9. ↑ 9.0 9.1 9.2 9.3 "Kepler-23 d Eyes on Exoplanets". https://exoplanets.nasa.gov/eyes-on-exoplanets/#/planet/Kepler-23_d/. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 "Kepler-23 d exoplanet kyoto". http://www.exoplanetkyoto.org/exohtml/Kepler-23_d.html. 

Coordinates: Sky map 19h 36m 52.0s, +49° 28′ 45″



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